Russian attacks outside Kyiv intensify

A military airfield south of Kyiv is hit by missiles as reports suggest the bulk of Russian forces are just 25km from the city.

Sirens are heard through the night in many other cities across Ukraine - from Lviv, in the west, to the north east region of Sumy - as Russia's troops push forward, reports BBC.

A mosque in the southern port of Mariupol, where 80 civilians were sheltering, was shelled by Russian forces, Ukrainian officials say.

People in the city are said to be enduring freezing temperatures with no power, and little food and water.

Russia has accused Ukraine of rejecting nearly all its offers to provide humanitarian corridors from flash-point towns.

US President Joe Biden restates his country will not directly intervene militarily against Russia in Ukraine.

Russia makes claims - without evidence - of US biological weapons activities in Ukraine at a meeting of the UN Security Council.

Ukraine suggests Belarus could join Russia's invasion in the coming hours.